امکان‌سنجی مقایسه‌ای دو سیستم پمپ حرارتی آبگرمکن خورشیدی انبساط مستقیم در آب و هوای رشت

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مهندسی مکانیک، دانشگاه ملی مهارت، تهران، ایران

2 گروه مهندسی برق، دانشگاه ملی مهارت، تهران، ایران

چکیده

در این پژوهش، مطالعه مقایسه‌ای تجربی و عددی بر روی دو سیستم پمپ حرارتی معمولی و پمپ حرارتی آبگرمکن انرژی خورشیدی انبساط مستقیم برای پتانسیل آب گرم مصرفی انجام شده است. سیستم پمپ حرارتی آبگرمکن انرژی خورشیدی انبساط مستقیم شامل کلکتور خورشیدی تخت به عنوان تبخیرکننده، یک کمپرسور هرمتیک از نوع چرخشی با مبرد R134a، یک لوله مویین به عنوان شیر انبساط و یک کندانسور مارپیچی پره‌دار غوطه‌ور و یک مخزن ذخیره آب 100 لیتری است. نتایج شبیه‌سازی برای دستیابی به طراحی بهینه سیستم و تعیین استراتژی مناسب برای چهار شرایط عملیاتی روز آفتابی، روز ابری، شب صاف و شب ابری مورد استفاده قرار گرفت. عملکرد هر دو سیستم به صورت تجربی و عددی بررسی شده است. تأثیرات شرایط عملیاتی (دمای هوا، دمای آب، شدت تابش خورشیدی و غیره) مورد تجزیه و تحلیل قرار گرفته و مقایسه عملکرد تحت شرایط عملیاتی مختلف بین دو سیستم انجام شده است. نتایج نشان می‌دهد که در شرایط روز آفتابی، ضریب عملکرد سیستم پمپ حرارتی آبگرمکن انرژی خورشیدی انبساط مستقیم به طور قابل توجهی بالاتر از سیستم پمپ حرارتی معمولی است. در شرایط روز ابری، ضریب عملکرد هر دو سیستم تقریباً یکسان است و در شرایط شب، به ویژه در شرایط شب صاف، سیستم پمپ حرارتی آبگرمکن انرژی خورشیدی انبساط مستقیم به دلیل عملکرد ضعیف تبادل حرارت همرفتی اواپراتور- کلکتور خورشیدی و اتلاف حرارت تابشی به آسمان در شب، عملکرد ضعیفی را نشان می‌دهد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Comparative Feasibility Study of Two Direct Expansion Solar Water Heater Heat Pump Systems in Rasht Climate

نویسندگان [English]

  • Vahid Rezaee 1
  • Abouzar Taghizadeh 2
  • Mojtab masomnezhad 1
1 Faculty Member, Department of Mechanical Engineering, National University of Skills (NUS), Tehran, Iran.
2 Assistant Professor, Department of Electrical Engineering, Technical and Vocational University (TVU), Tehran, Iran
چکیده [English]

In this research, an experimental and numerical comparative study has been conducted on two systems: conventional heat pump (ASHP) and direct expansion solar water heater heat pump (DX-SAHP) for the potential of hot water production. The system (DX-SAHP) consists of a flat plate solar collector as an evaporator, a rotary hermetic compressor with R134a refrigerant, a capillary tube as an expansion valve, and a submerged finned spiral condenser and a 100-liter water storage tank. The simulation results were used to achieve optimal system design and determine the appropriate strategy for four operating conditions: sunny day, cloudy day, clear night, and cloudy night. The simulation results were used to achieve optimal system design and determine the appropriate strategy for four operating conditions: sunny day, cloudy day, clear night, and cloudy night. The performance of both systems has been investigated experimentally and numerically. The effects of operating conditions (air temperature, water temperature, solar radiation intensity, etc.) have been analyzed and a comparison of performance under different operating conditions between the two systems has been made. The results show that under sunny day conditions, the coefficient of performance (COP) of the (DX-SAHP) system is significantly higher than that of (ASHP). Under cloudy day conditions, the coefficient of performance of both systems is almost the same, and under night conditions, especially under clear night conditions, (DX-SAHP) shows poor performance due to poor performance of convective heat exchange of solar collector-evaporator and radiant heat loss to the night sky.

کلیدواژه‌ها [English]

  • Thermodynamic Analysis
  • Heat Pump
  • Domestic Hot Water
  • Solar Energy
  • Coefficient of Performance

مراجع

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نشریه مهندسی مکانیک امیرکبیر
دوره 57، شماره 5
مرداد 1404
صفحه 589-610

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